Preparation of temperature-controlled heteropolyacid ionic liquids and their application for synthesis of diphenyl carbonate was written by Jiang, Zezhong;Wang, Haiyue;Shan, Lining;Zheng, Rongrong;Zhao, Xiudan;Liao, Zhangbin;Guo, Liying. And the article was included in Catalysis Letters.Name: Diphenyl carbonate The following contents are mentioned in the article:
First, an intermediate ionic liquid [Bmim]Cl and Keggin-type heteropolyacids with different metal vacancies were prepared, and then prepared six heteropolyacid ionic liquids by the ion exchange method, and these liquids were tested and analyzed for chem. structures, crystal structures, thermal stability, and apparent morphol. After that, the six heteropolyacid ionic liquids were used to catalyze the transesterification reaction between phenol and di-Me carbonate (DMC) to synthesize di-Ph carbonate (DPC), to explore the effects of reaction temperature, reaction time, and catalyst dosage on the catalytic performance, and reveal the catalytic mechanism. The results showed that the six heteropolyacid ionic liquids prepared were the target products with good thermal stability. Compared with traditional catalysts Cp2TiCl2 and C16H36O4Ti, they had better catalytic performance in the catalytic process. Among them, Bmim4[Ti(H2O)TiMo11O39] manifested the best catalytic performance. Under the conditions that the molar ratio of raw materials DMC to phenol was 2:1, reaction temperature 180 掳C, catalyst consumption 1.5% of the total mass of the raw materials, and reaction time 8 h, the conversion rate of phenol reached 46.17%, and the overall selectivity of products monophenyl carbonate (MPC) and DPC was 98.89%. As a phase transfer catalyst characterized by a “homogeneous phase at high temperature and separation at low temperature,” the catalyst can be self-assembled in the catalytic process with the temperature change. Therefore, they can be recycled and reused through simple washing and filtering at the end of the reaction. After five times of recycling, the catalytic performance of the catalyst reduces significantly, in which case the fresh catalyst should be added to maintain a good catalytic performance. This study involved multiple reactions and reactants, such as Diphenyl carbonate (cas: 102-09-0Name: Diphenyl carbonate).
Diphenyl carbonate (cas: 102-09-0) belongs to esters. Esters perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. Polyesters are important plastics, with monomers linked by ester moieties. Esters contain a carbonyl center, which gives rise to 120掳 C鈥揅鈥揙 and O鈥揅鈥揙 angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C鈥揙鈥揅 bonds has a low barrier. Their flexibility and low polarity is manifested in their physical properties; they tend to be less rigid (lower melting point) and more volatile (lower boiling point) than the corresponding amides. Name: Diphenyl carbonate
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics